/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package com.feilong.lib.org.apache.http.impl.pool;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

import javax.net.SocketFactory;
import javax.net.ssl.SSLSocketFactory;

import com.feilong.lib.org.apache.http.HttpClientConnection;
import com.feilong.lib.org.apache.http.HttpConnectionFactory;
import com.feilong.lib.org.apache.http.HttpHost;
import com.feilong.lib.org.apache.http.annotation.Contract;
import com.feilong.lib.org.apache.http.annotation.ThreadingBehavior;
import com.feilong.lib.org.apache.http.config.ConnectionConfig;
import com.feilong.lib.org.apache.http.config.SocketConfig;
import com.feilong.lib.org.apache.http.impl.DefaultBHttpClientConnectionFactory;
import com.feilong.lib.org.apache.http.pool.ConnFactory;
import com.feilong.lib.org.apache.http.util.Asserts;

/**
 * A very basic {@link ConnFactory} implementation that creates
 * {@link HttpClientConnection} instances given a {@link HttpHost} instance.
 *
 * @see HttpHost
 * @since 4.2
 */
@SuppressWarnings("deprecation")
@Contract(threading = ThreadingBehavior.IMMUTABLE_CONDITIONAL)
public class BasicConnFactory implements ConnFactory<HttpHost, HttpClientConnection>{

    private final SocketFactory                                         plainfactory;

    private final SSLSocketFactory                                      sslfactory;

    private final int                                                   connectTimeout;

    private final SocketConfig                                          sconfig;

    private final HttpConnectionFactory<? extends HttpClientConnection> connFactory;

    //    /**
    //     * @deprecated (4.3) use
    //     *             {@link BasicConnFactory#BasicConnFactory(SocketFactory, SSLSocketFactory, int,
    //     *             SocketConfig, ConnectionConfig)}.
    //     */
    //    @Deprecated
    //    public BasicConnFactory(final SSLSocketFactory sslfactory, final HttpParams params){
    //        super();
    //        Args.notNull(params, "HTTP params");
    //        this.plainfactory = null;
    //        this.sslfactory = sslfactory;
    //        this.connectTimeout = params.getIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 0);
    //        this.sconfig = HttpParamConfig.getSocketConfig(params);
    //        this.connFactory = new DefaultBHttpClientConnectionFactory(HttpParamConfig.getConnectionConfig(params));
    //    }
    //
    //    /**
    //     * @deprecated (4.3) use
    //     *             {@link BasicConnFactory#BasicConnFactory(int, SocketConfig, ConnectionConfig)}.
    //     */
    //    @Deprecated
    //    public BasicConnFactory(final HttpParams params){
    //        this(null, params);
    //    }

    /**
     * @since 4.3
     */
    public BasicConnFactory(final SocketFactory plainfactory, final SSLSocketFactory sslfactory, final int connectTimeout,
                    final SocketConfig sconfig, final ConnectionConfig cconfig){
        super();
        this.plainfactory = plainfactory;
        this.sslfactory = sslfactory;
        this.connectTimeout = connectTimeout;
        this.sconfig = sconfig != null ? sconfig : SocketConfig.DEFAULT;
        this.connFactory = new DefaultBHttpClientConnectionFactory(cconfig != null ? cconfig : ConnectionConfig.DEFAULT);
    }

    /**
     * @since 4.3
     */
    public BasicConnFactory(final int connectTimeout, final SocketConfig sconfig, final ConnectionConfig cconfig){
        this(null, null, connectTimeout, sconfig, cconfig);
    }

    /**
     * @since 4.3
     */
    public BasicConnFactory(final SocketConfig sconfig, final ConnectionConfig cconfig){
        this(null, null, 0, sconfig, cconfig);
    }

    /**
     * @since 4.3
     */
    public BasicConnFactory(){
        this(null, null, 0, SocketConfig.DEFAULT, ConnectionConfig.DEFAULT);
    }

    //    /**
    //     * @deprecated (4.3) no longer used.
    //     */
    //    @Deprecated
    //    protected HttpClientConnection create(final Socket socket,final HttpParams params) throws IOException{
    //        final int bufsize = params.getIntParameter(CoreConnectionPNames.SOCKET_BUFFER_SIZE, 8 * 1024);
    //        final DefaultBHttpClientConnection conn = new DefaultBHttpClientConnection(bufsize);
    //        conn.bind(socket);
    //        return conn;
    //    }

    @Override
    public HttpClientConnection create(final HttpHost host) throws IOException{
        final String scheme = host.getSchemeName();
        final Socket socket;
        if ("http".equalsIgnoreCase(scheme)){
            socket = this.plainfactory != null ? this.plainfactory.createSocket() : new Socket();
        }else if ("https".equalsIgnoreCase(scheme)){
            socket = (this.sslfactory != null ? this.sslfactory : SSLSocketFactory.getDefault()).createSocket();
        }else{
            throw new IOException(scheme + " scheme is not supported");
        }
        final String hostname = host.getHostName();
        int port = host.getPort();
        if (port == -1){
            if (host.getSchemeName().equalsIgnoreCase("http")){
                port = 80;
            }else if (host.getSchemeName().equalsIgnoreCase("https")){
                port = 443;
            }
        }
        socket.setSoTimeout(this.sconfig.getSoTimeout());
        if (this.sconfig.getSndBufSize() > 0){
            socket.setSendBufferSize(this.sconfig.getSndBufSize());
        }
        if (this.sconfig.getRcvBufSize() > 0){
            socket.setReceiveBufferSize(this.sconfig.getRcvBufSize());
        }
        socket.setTcpNoDelay(this.sconfig.isTcpNoDelay());
        final int linger = this.sconfig.getSoLinger();
        if (linger >= 0){
            socket.setSoLinger(true, linger);
        }
        socket.setKeepAlive(this.sconfig.isSoKeepAlive());
        // Run this under a doPrivileged to support lib users that run under a SecurityManager this allows granting connect permissions
        // only to this library
        final InetSocketAddress address = new InetSocketAddress(hostname, port);
        try{
            AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () -> {
                socket.connect(address, BasicConnFactory.this.connectTimeout);
                return null;
            });
        }catch (final PrivilegedActionException e){
            Asserts.check(
                            e.getCause() instanceof IOException,
                            "method contract violation only checked exceptions are wrapped: " + e.getCause());
            // only checked exceptions are wrapped - error and RTExceptions are rethrown by doPrivileged
            throw (IOException) e.getCause();
        }
        return this.connFactory.createConnection(socket);
    }

}
